Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ef933ced725ad7…

MALICIOUS

PDF

67.8 KB Created: 2021-03-12 04:49:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41b041650c538af6326402138be73303 SHA-1: 2cc8256e0675d2a1c5f9525276e607e7f356f1cf SHA-256: 81ef933ced725ad753147b927a1640a5ca821d083d55eb6840d0abd2e11d842c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a URL that is likely part of a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of the external URI suggests an attempt to redirect the user to a malicious site. No scripts were extracted, but the PDF structure and embedded URI are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/wix?keyword=drz400sm+owners+manual
    • https://cdn.sqhk.co/jefulajidi/ZZjgjhb/best_online_city_builder_games.pdf
    • https://cdn.sqhk.co/molodomo/7haWTge/48351855193.pdf
    • https://cdn.sqhk.co/lozuzupadis/7Acjd10/best_free_ringtone_app_for_iphone_8.pdf
    • https://cdn.sqhk.co/tirabipati/hicihhb/ludo_king_mod_apk_2019.pdf
    • http://purubifo.medianewsonline.com/mean_value_theorem_problems_and_solutions.pdf
    • https://cdn.sqhk.co/wuwexosul/zjajiV4/23935423993.pdf
    • http://gazozasi.scienceontheweb.net/malipan.pdf
    • https://cdn.sqhk.co/tavaxiwugo/jehjwYN/41954623520.pdf
    • http://zikewexer.scienceontheweb.net/how_to_find_my_bosch_oven_model_number.pdf
    • http://wudebakafepi.mypressonline.com/the_graveyard_book_movie.pdf
    • https://cdn.sqhk.co/rubupidorinu/cwzvhe1/63628160337.pdf
    • http://bexowobiminefi.mywebcommunity.org/75948869363.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vidugozu.atwebpages.com/98747171856.pdf
    • http://gofudawaropuz.epizy.com/agricultural_power_and_machinery.pdf
    • https://uploads.strikinglycdn.com/files/1c0748d6-c154-42a9-99f5-1ce106daecda/is_unreal_engine_free_to_use.pdf
    • https://uploads.strikinglycdn.com/files/2e1cf76a-e44c-42a6-ad3b-d1ca7c684449/best_way_to_write_an_introduction_and_conclusion.pdf
    • http://kipixuge.epizy.com/4145439300.pdf
    • https://uploads.strikinglycdn.com/files/15ef9a92-2f76-41ef-9aa5-449d18f53975/greek_gods_and_goddesses_symbols_list.pdf
    • http://joxegav.rf.gd/19875122705.pdf
    • http://rasunafosav.epizy.com/41337750395.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc45.bin
f31f829274602e4b318423511b31455d640e8a98b34eeaf5b51eeb1858c2071d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC45 5200 bytes
font_01_sfnt_off0000de00.bin
6d6ca1583594e70dbdb17396b464b24925283852c48aa793495153b3b28532ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 10408 bytes